Natural draft oil burner



May 2, 1950 J. R. CLARK 2,506,138

NATURAL DRAFT OIL BURNER Filed oct. 28, 1946 A T TORNE Y viesoascuas Nn'runsnnnm on. Burman .1 olm Ramsay' Clark, Vancouver, British columbia, canada Application October 28, 1946, Serial No. 706.126

, l My invention relates to ural draft oil burners.

improvements in nat- The objectv of the invention is to-provide anv oil burner of the so-oalled pot type inwhich substantially. complete combustion is promoted with the resultant lack of smoke and lack of carbon coating of the flue surfaces, and vto provide a construction where the base of the. burner is kept relatively cool to prevent carbon deposit in the base of said pot. v

Referring to the drawings:

realm. iol. 15s-'91) 2 vThe plate I3 is provided adjacent its long edge with a plurality of apertures 32 and is preferably Fig. 1 is a plan view, partly broken away.v of

the invention. l

Fig. 2 is a sectional view taken on the line 2 2 oi' Figure 1. v

Figure 3 is a'sectional view of a cook stoveiltted with the invention.

`In the drawings like characters of reference indicate corresponding parts in each ligure.

The numeral I indicates generally a cook stove having a iire box 2, an oven 3, a hot plate l vand a ilue 5 defined between said oven and hot plate. Theiire box 2 is iitted with angle iron brackets 1 to support the pot burnert and a ilre brick lining 9 for the upper part of the ilre box, which is provided with a plurality of draft aperturesv 22 which are evenly spaced about its wall Il for the admission of air to support combustion of the fuel. `A fuel feed pipe 24 enters the wall Il adjacent the bottom wall I3 and a shrouded opening 25 is formed in the side wall I4 adjacent the bottom to afford access to the generator for a taper to ignite the fuel therein.

Extending upwardly through the bottom `wall I3 and substantially to the level of the top wall flange I5, is one or more open ended vertical tubes 21, each oi' which are restricted at the base as at 23 to impede the upward flow of air therethrough, so that the air will attain a high temperature before it discharges from the upper end of said tube.

'I'he upper portion of the peripheral wall I3 is provided with rows of small staggered apertures 29 which are relatively small in diameter and two or more triangular zones 33 at the base of the wall are provided with larger apertures 3I. The zones 30 are spaced .from'each other as shown.

provided with similar apertures 33 adjacent its short edges, all of which apertures communicate between the iire space I0 and the ilre box or zone 2 below said plate I9, the opening 20 is substantially less than the diameter of the combustion chamber I1 and is surmountedby a disc 33 supported upon separators 31 and has a central aperture 38 through which the major part of the llame burns. The spacing of the disc 33 from the plate I3 permits secondary air admitted through the apertures 33 to combine with the flame and to preclude the possibility of the ilame being blown out when a cover plate oi' the stove is raised, a failing which is common with many pot type burners.

As a means for preventing any tendency to smoking incidental to extensive change in the fuel being fed to the burner, I provide a plate 3l having'supporting legs 4I, which slips over the tubes 21 and stands upon the bottom wall I3 of the generator body I2, in spaced relation thereto. With the use of this plate, excessive heat is kept away from the central area of the oil in the generator, so that said oil will continue to burn solely in the annular space 43 between the plate 40 and the side wall Il.

In operation, fuel is allowed to ilow into the generator body I2 and spread across its bottom wall I3 and then is ignited by means of an open flame inserted into the generator through the shrouded opening 25. The flame resulting, heats pipes 21 and causes an updraught therein, which draught is relatively slow'owing to the restriction 28 at the base of the pipes, but by virtue of slow movement becomes heated to substantially the temperature of the generator llame. Air enters the generator body through the apertures in sumcient volume to support a flame from the burning fuel of relatively low heat, this incoming air serves to keep the ilame spaced from the side wall I4 and prevents undue heat transfer to the bottom wall I3, thus preventing the carbonization of fuel upon said bottom wall. As the llame reaches the combustion chamber, it receives the highly heated air from the tubes 21 and relatively cool air from the small apertures 23 and from the larger apertures 3I of the triangular zones 30. The hot air from the tubes 21 assists in vaporizing any unignited fuel passing through the combustion chamber and the air from the apertures 29 and 3I intensifies said flame, air iiow through the apertures 3l being less restricted than that ilowing through the apertures 23 causes a high turbulence without causing noise in the immer. The name emanating from the top opening Il of the combustion chamber spreads under the hot plate 4 of the cook stove and passes through to the ilue 5 and in so doing is met with a small ilow of highly heatedl air from the apertures 82 and 3l in the plate I9.

The-device in operation, burns its fuel as effectively as a burner equipped with a blower and is quite noiseless and odorless due in a great measure to the high temperature of the air entering the combustion chamber and the turbulence set up therein and the cleanliness of the generator is largely due to the relatively low temperature of the base of said generator.

What I claim as my invention is:

An oil burner comprising a generator body havingA a bottom wall, apertured side walls and a top wail having an opening, a peripheral wall of lesser cross section than the generator body forming a combustion chamber and being carried Vupon the top wall of the generator body, said wall bordering theopening of the top wall of the generator body, said peripheral wall having a pair of zones of apertures separated circumferentially from each other and spaced diametrically opposite each other in said vertical wall and an air tube supported vertically in the bottom wall of the generator. body, said air tube being open to the exterior of the generator body at its base and to the combustion chamber at its upper end, said tube being restricted at its lower end and adapted to convey air from below the generator body and to deliver said air into the combustion chamber and at low velocity.

JOHN RAMSAY CLARK.

REFERENCES CITED The following references are of record in the le of this patent:

UNITED STATES PATENTS Number Name Date 1,670,033 Gilmore et al. May 15, 1928 1,950,161 Bock Mar. 6, 1934 2,165,212 Bauer July 11, 1939 2,204,694 Piehl June 18, 1940 2,214,693 Grotenhuis Sept. 10, 1940 2,225,467 Breese Dec. 17, 1940 2,263,737 Miller Nov. 25, -1941 2,267,531 Martin Dec. 23, 1941 2,272,423 Moore Feb. 10, 1942 2,286,489 Jones June 16, 1942 2,302,287 Behrendt et al. Nov. 17, 1942 2,361,912 Breese Nov. 7, 1944 2,375,471 Hodges May 8, 1945 FOREIGN PA'IENTS Number Country Date 341,052 Great Britain Jan. 6, 1931 Great Britain Oct. 24, 1934 

